That's a good way to test. I followed the instructions in the README (only the required steps and the customized osso-wlan step). After rebooting and running `sh load.sh` I ran the same test using aireplay-ng and it confirmed that injection was working. I'm not sure what's wrong in your case. Try checking to see if the driver is loaded using `lsmod`, that the interface is up `ifconfig wlan0` and make sure the card is in monitor mode using `iwconfig wlan0`. Also, don't foget that you need to run load.sh each time you reboot (unless you make some changes to run this automatically on boot).